Try altering the Settings which might be related to it (airplane details, etc.). Or are you playing with max-Settings?. Maybe clearing the cache also helps. If nothing else works, let Steam check your game-files.

Blury textures are a problem of the game but can be adressed with SweetFX and fiddeling around with the grapics-Settings or by Downsampling (which could be possible with your Graphics-Card, google it).

Hello all, have just installed this for a third time for the same reason and have tried deleting the cache as well, so I now have a perfectly working sim with awesome frame rates with Vid maxed out but have the same blurry gun sight ,,,,,,,only on fighters,, on Ju 88 as well as Ju 87 they are perfect.
this is why I think it is a minor issue but I just don't have the background to remedy the issue, has anybody else noticed that the bombers work fine or is the issue a wee bit different for everyone?
with years behind me playing flight sims, im thinking this could be fixed in the config file but not sure what would be a place to start looking.